This is a better alternative than the script I just posted above.  It copies the morph deltas directly, rather than messing with worldspace.  It can both mirror (copy one side to another on an X-symmetrical actor) and flip (swap both sides of a morph).  The flip function will copy between right side and left side actors, if they have compatible geometries.  Above all, it does not require any extra PoserPython extensions, so it will work in all versions of Poser.

I just patched this together for my own use with Antonia development.  Even so, my apologies that I'm veering off-topic, here....  :blushing:

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.